A Novel Detection Method Based on Generalized Keystone Transform and RFT for High-Speed Maneuvering Target

Abstract

The coherent integration problem for a space moving target with high-speed maneuvering performance is considered in this paper .The radial velocity, acceleration and jerk of the maneuvering target would result in the first-order range migration (FRM), second-order range migration (SRM) and third-order range migration (TRM) respectively within the coherent integration time. This paper proposes a novel long time coherent integration method based on generalized keystone transform (GKT) and Radon Fourier transform (RFT). Firstly, third-order and six-order keystone transform are used to correct TRM and SRM, respectively and the improved de-chirping method is utilized to compensate for the Doppler spread (DS). Then, residual range migration (RM) will be corrected by RFT. This algorithm can correct RM without knowing its motion information. The advantage of the proposed approach is that it can achieve the coherent integration under the condition of Doppler frequency ambiguity. The computational burden of the proposed method is less than that of GRFT algorithm. Finally, simulations are performed to demonstrate the validity of the proposed algorithm.

Efficient Implementation of Aperture Fill Time Correction for Wideband Array Using the Low-complexity Keystone Transform

“…The entire process of the KT transform has been completed in (10). Once being processed by the CZT, the signal transitions from the spatial domain to the frequency domain, resulting in a twodimensional frequency domain representation.…”

“…A large amount of filters will increase the computational burden of the algorithm, and conversely, performance loss will be inevitable. However, the Keystone (KT) transform [8][9][10], known as an effective envelope alignment technique, has been widely used in the fields of radar target detection and target imaging. The KT transform can align all the frequency points of the wideband signal to the carrier frequency by preprocessing the signal in the frequency-spatial domain, which can effectively solve the problem caused by AFT.…”

An Efficient Adbf Algorithm Based on Keystone Transform for Wideband Array System

“…In this paper, considering the performance loss caused by the aperture effect in wideband arrays, keystone transform [8][9][10][11][12] is applied for the aperture effect of the received wideband array signal model for its capability to achieve envelope alignment. Besides, the performance of ADBF is severely degraded, in the case that the target signal is present in the training samples since the target signal is considered as interference to be suppressed.…”

Fast long‐time coherent integration algorithm for detecting manoeuvring targets with high‐order motion parameters based on GKT and ISCPF

“…However, this method is often computationally prohibitive due to the four‐dimensional search of slant range, velocity, acceleration, and jerk, which limits its practical applications. More recently, methods involving KT and generalised KT (GKT) are proposed [35–40] for correcting RM. The method based on GKT and second‐order de‐chirp process (GKT‐SDP) [35] and the method based on generalised KT and matching filtering function (KT‐MFF) [36] can reduce the complexity by employing a two‐dimensional search instead.…”

“…It can achieve good SAR imaging quality with relatively high SNR since the third‐order Doppler frequency migration (DFM) is effectively eliminated. The KT‐RFT [40] can achieve coherent integration when the jerk is present, but it is computationally prohibitive because several RFTs are performed.…”